A vaccine-preventable disease is an infectious disease for which an effective preventive vaccine exists.[1][2] If a person acquires a vaccine-preventable disease and dies from it, the death is considered a vaccine-preventable death.[citation needed]
The most common and serious vaccine-preventable diseases tracked by the World Health Organization (WHO) are: diphtheria, Haemophilus influenzae serotype b infection, hepatitis B, measles, meningitis, mumps, pertussis, poliomyelitis, rubella, tetanus, tuberculosis, and yellow fever.[3] The WHO reports licensed vaccines being available to prevent, or contribute to the prevention and control of, 31 vaccine-preventable infections.[4]